import {createApp} from 'vue'
import App from './App.vue'
import router from './router'
import store from './store'
//1.引入element-plus组件库与其样式
import ElementPlus, {ElMessage} from 'element-plus'
import 'element-plus/dist/index.css'
//2.引入element-plus图标库,并起别名为ElementPlusIconsVue
import * as ElementPlusIconsVue from '@element-plus/icons-vue'
//6.1修改elementPlus默认中文
import zhCn from 'element-plus/dist/locale/zh-cn.mjs'
import axios from "axios";

//9.1 配置后端服务器根路径
const BASE_URL = 'http://localhost:8080';
//window是浏览器内置的全局对象,给它设置属性就相当于设置全局属性,可以在任意script中使用!
window.BASE_URL = BASE_URL;

const app = createApp(App)/* 创建vue实例,并起名为app */
//9.2 给app也添加一个属性BASE_URL,确保后端服务器根路径可以在任意template中使用
app.config.globalProperties.BASE_URL = BASE_URL;

//3.将所有导入的图标组件变为键值对数组,并依次遍历取出每一个图标组件[key, component]
for (const [key, component] of Object.entries(ElementPlusIconsVue)) {
    // 4.将当前遍历到的图标组件注册为当前vue实例的全局组件
    app.component(key, component)
}
//5.为前vue实例应用element-plus组件库
//6.2 app.use(ElementPlus,{ locale: zhCn })将El本地化为中文
app.use(ElementPlus, {locale: zhCn}).use(store).use(router).mount('#app')

//7.解决ResizeObserver Error
const debounce = (fn, delay) => {
    let timer = null;
    return function () {
        let context = this;
        let args = arguments;
        clearTimeout(timer);
        timer = setTimeout(function () {
            fn.apply(context, args);
        }, delay);
    }
}
const _ResizeObserver = window.ResizeObserver;
window.ResizeObserver = class ResizeObserver extends _ResizeObserver {
    constructor(callback) {
        callback = debounce(callback, 16);
        super(callback);
    }
}

//8.配置路由守卫
//to 即将要进入的路由
//from 当前路由
//next 放行函数,必须通过它才能路由跳转
router.beforeEach((to, from, next) => {
    //获取当前登录的用户数据
    let user = localStorage.user;
    //如果当前人未登录,且去的不是登录页,就提示用户"请先登录"并跳转至登录页
    if (to.path !== '/login' && !user) {
        next({path: '/login'}, ElMessage.error('请先登录!'));
    } else {
        next();//直接放行
    }
});

//10.获取当前登录人的数据
window.getUser = () => {
    //如果当前人已登录,就将获取到用户JSON字符串恢复为JS对象并返回
    //如果当前人未登录,则返回null
    return localStorage.user ? JSON.parse(localStorage.user) : null;
}

//11.创建根据字典code查字典项的全局方法
window.loadDictOptions = (object, dictCode) =>{
    //向后端发请求
    axios.get(BASE_URL+'/v1/dictoption/select/'+dictCode).then((response)=>{
        if(response.data.code == 2000){
            //将响应数据中的字典项数组赋值给object
            object.value = response.data.data;
        }else{
            ElMessage.error(response.data.message);
        }
    })
}



